Boulder’s Iconic Peaks
The Flatirons are the unmistakable backdrop to Boulder, Colorado. These dramatic, slanted sandstone formations rise above the city, shaping its identity and luring outdoor enthusiasts from around the world. Whether you’re a first-time visitor or a seasoned local, exploring the Flatirons offers a quintessential Boulder experience—steeped in history, adventure, and natural beauty.
A Geological Marvel
Formed nearly 300 million years ago, the Flatirons are part of the Fountain Formation, made of red sandstone and conglomerate rock. Over millions of years, tectonic forces tilted these slabs at striking angles, creating the five prominent “Flatirons” visible today. Their name, coined in the early 1900s, comes from their resemblance to…..